PDCLC liquid crystal light-adjusting film sheet

Abstract

The utility model provides a kind of PDCLC liquid crystal light control film piece, including two layers ITO film and electrochromic layer, the electrochromic layer is located between two layers the ITO film, the PDCLC liquid crystal light control film piece further includes composite structure, the composite structure is located between the ITO film with the electrochromic layer, the composite structure includes metal grid layer and porous isolation layer, the electrochromic layer is connected with the one side of the metal grid layer by porous isolation layer, the other side of the metal grid layer is connected with the ITO film, by the present application, in large-area application, the square resistance of the PDCLC liquid crystal light control film piece is effectively reduced, and the problem of uneven response and high power consumption is improved.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal dimming technology, and in particular to a PDCLC liquid crystal dimming film. Background Technology

[0002] Polymer dispersed color liquid crystal dimming film (PDCLC) is a smart thin film material that uses an electric field to control the arrangement of liquid crystal molecules to achieve reversible switching of optical states. PDCLC liquid crystal dimming film usually uses two layers of indium tin oxide (ITO) transparent conductive film as electrodes, with a liquid crystal layer sandwiched in between.

[0003] However, as a transparent conductive oxide, ITO thin film has a high sheet resistance (typically 10~100 Ω / sq), which presents the following drawbacks for large-area applications:

[0004] Uneven response: The sheet resistance of ITO causes the voltage to decay significantly from the edge to the center, resulting in an uneven distribution of the electric field on the film surface, and an uneven color change phenomenon of "changing at the edge first and then at the center".

[0005] Higher power consumption: High sheet resistance requires a larger drive current or a higher drive voltage to maintain the entire transparent state, which leads to increased system power consumption. Utility Model Content

[0006] Therefore, the purpose of this utility model is to provide a PDCLC liquid crystal dimming film to overcome the shortcomings of the prior art.

[0007] To achieve the above objectives, this utility model provides a PDCLC liquid crystal dimming film, comprising two ITO films and an electrochromic layer, wherein the electrochromic layer is located between the two ITO films. The PDCLC liquid crystal dimming film further includes a composite structure located between the ITO films and the electrochromic layer. The composite structure includes a metal mesh layer and a porous isolation layer. The electrochromic layer is connected to one side of the metal mesh layer through the porous isolation layer, and the other side of the metal mesh layer is connected to the ITO films.

[0008] The beneficial effects of this invention are as follows: by setting a composite structure between the ITO film and the electrochromic layer, and designing the composite structure as a metal mesh layer and a porous isolation layer, the sheet resistance of the ITO film is reduced by using the metal mesh layer, and the porous isolation layer is used to prevent the metal mesh layer from contacting the electrochromic layer and prevent corrosion of the metal mesh layer. Unlike the prior art, this invention can effectively reduce the sheet resistance of the PDCLC liquid crystal dimming film in large-area applications, and improve the problems of uneven response and high power consumption caused by high sheet resistance.

[0009] Preferably, the thickness of the metal mesh layer is 10nm-100nm, the linewidth of the metal mesh layer is 3μm-10μm, and the aperture ratio of the metal mesh layer is greater than 90%.

[0010] Preferably, the thickness of the porous isolation layer is 300nm-500nm.

[0011] Preferably, the porosity of the porous isolation layer is 30%-50%, and the pore size of the porous isolation layer is 2nm-10nm.

[0012] Preferably, the metal mesh layer is a mesh-shaped silver layer.

[0013] Preferably, the porous isolation layer comprises a dense sublayer and a porous sublayer, wherein the thickness of the dense sublayer is 10nm-20nm and the thickness of the porous sublayer is 200nm-500nm.

[0014] Preferably, the PDCLC liquid crystal dimming film includes a release film, which is located on the side of the ITO film away from the electrochromic layer, and the release film is stacked with the ITO film.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the PDCLC liquid crystal dimming film provided in the first embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the PDCLC liquid crystal dimming film provided in the second embodiment of the present invention.

[0018] Explanation of key component symbols:

[0019] 10. ITO film; 20. Electrochromic layer; 30. Porous isolation layer; 40. Metal mesh layer; 41. Barrier layer; 50. Release film; 61. Dense sublayer; 62. Porous sublayer.

[0020] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0022] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] Please see Figure 1 The PDCLC liquid crystal dimming film in the first embodiment of this utility model includes an ITO film 10, an electrochromic layer 20, and a composite structure.

[0025] The ITO film 10 consists of two layers, with an electrochromic layer 20 located between the two ITO film layers 10. A composite structure is located between the ITO film 10 and the electrochromic layer 20. The composite structure includes a metal mesh layer 40 and a porous isolation layer 30. The metal mesh layer 40 is a mesh-like silver layer, and the porous isolation layer 30 is one of SiO2, TiO2, or Al2O3. The metal mesh layer 40 is used to reduce the sheet resistance of the ITO film, and the porous isolation layer 30 is used to prevent the metal mesh layer 40 from directly contacting the electrochromic layer 20 without affecting ion conduction, thus protecting the metal mesh layer 40 from electrochemical corrosion. The electrochromic layer 20 is connected to one side of the metal mesh layer 40 through the porous isolation layer 30, and the other side of the metal mesh layer 40 is connected to the ITO film 10. It should be noted that the design of the metal mesh layer 40 and the porous isolation layer 30 can ensure both low sheet resistance and high transmittance.

[0026] In this embodiment, the PDCLC liquid crystal dimming film also includes a release film 50, which is connected to the side of the ITO film 10 away from the composite structure. There are two release films 50, which sandwich the ITO film, the electrochromic layer 20 and the composite structure. That is, the structure of the PDCLC liquid crystal dimming film is: release film 50 - ITO film - metal mesh layer 40 - porous isolation layer 30 - electrochromic layer 20 - porous isolation layer 30 - metal mesh layer 40 - ITO film 10 - release film 50.

[0027] It should be noted that this embodiment adopts a completely symmetrical design, with stress balance on both sides and high flatness of the diaphragm. At the same time, the electrochromic layer 20 can change color in either the forward or reverse direction. The symmetrical structure ensures consistent performance in both forward and reverse driving and is also convenient for production.

[0028] In this embodiment, in order to prevent the metal mesh layer 40 from easily migrating in a humid environment or under an electric field, a barrier layer is provided on both sides of the metal mesh layer 40. The barrier layer 41 is one of ITO thin layer, NiCr layer and silver alloy layer, so as to improve the corrosion resistance of the metal mesh layer 40.

[0029] In this embodiment, the thickness of the metal mesh layer 40 is 10nm-100nm, the linewidth of the metal mesh layer 40 is 3μm-10μm, and the aperture ratio of the metal mesh layer 40 is greater than 90%.

[0030] In this embodiment, the thickness of the porous isolation layer 30 is 300nm-500nm.

[0031] In this embodiment, the porosity of the porous isolation layer 30 is 30%-50%, and the pore size of the porous isolation layer 30 is 2nm-10nm, so as to ensure sufficient ion flux and effectively block the migration of silver ions.

[0032] In this embodiment, the electronic resistivity of the porous isolation layer 30 is greater than 10. 10 Ω·cm, to ensure minimal leakage current and prevent self-discharge.

[0033] In practical implementation, a composite structure is set between the ITO film 10 and the electrochromic layer 20. The composite structure is designed as a metal mesh layer 40 and a porous isolation layer 30. The metal mesh layer 40 is used to reduce the sheet resistance of the ITO film, and the porous isolation layer 30 is used to prevent the metal mesh layer 40 from contacting the electrochromic layer 20, thus preventing corrosion of the metal mesh layer 40. Unlike existing technologies, in large-area applications, this method does not affect ion conduction and can effectively reduce the sheet resistance of the PDCLC liquid crystal dimming film, thereby improving the problems of uneven response and high power consumption caused by high sheet resistance.

[0034] like Figure 2 As shown, this is a PDCLC liquid crystal dimming film in the second embodiment of the present invention. The difference between the PDCLC liquid crystal dimming film in the second embodiment and the PDCLC liquid crystal dimming film in the first embodiment is that the porous isolation layer 30 includes a stacked dense sublayer 61 and a porous sublayer 62. The dense sublayer 61 is connected to the metal mesh layer 40, and the porous sublayer 62 is located between the dense sublayer 61 and the electrochromic layer 20. The thickness of the dense sublayer 61 is 10nm-20nm, and the thickness of the porous sublayer 62 is 200nm-500nm. The material of the dense sublayer 61 is Al2O3, and the material of the porous sublayer 62 is SiO2.

[0035] It should be noted that the above implementation process is only to illustrate the feasibility of this application, but it does not mean that the PDCLC liquid crystal dimming film of this application has only the above-mentioned single implementation process. On the contrary, as long as the PDCLC liquid crystal dimming film of this application can be implemented, it can be included in the feasible implementation scheme of this application.

[0036] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A PDCLC liquid crystal dimming film, comprising two ITO films and an electrochromic layer, wherein the electrochromic layer is located between the two ITO films, characterized in that, The PDCLC liquid crystal dimming film also includes a composite structure located between the ITO film and the electrochromic layer. The composite structure includes a metal mesh layer and a porous isolation layer. The electrochromic layer is connected to one side of the metal mesh layer through the porous isolation layer, and the other side of the metal mesh layer is connected to the ITO film.

2. The PDCLC liquid crystal dimming film according to claim 1, characterized in that, The thickness of the metal mesh layer is 10nm-100nm, the linewidth of the metal mesh layer is 3μm-10μm, and the aperture ratio of the metal mesh layer is greater than 90%.

3. The PDCLC liquid crystal dimming film according to claim 1, characterized in that, The thickness of the porous isolation layer is 300nm-500nm.

4. The PDCLC liquid crystal dimming film according to claim 1, characterized in that, The porosity of the porous isolation layer is 30%-50%, and the pore size of the porous isolation layer is 2nm-10nm.

5. The PDCLC liquid crystal dimming film according to claim 1, characterized in that, The metal mesh layer is a mesh-shaped silver layer.

6. The PDCLC liquid crystal dimming film according to claim 1, characterized in that, The porous isolation layer includes a dense sublayer and a porous sublayer, wherein the thickness of the dense sublayer is 10nm-20nm and the thickness of the porous sublayer is 200nm-500nm.

7. The PDCLC liquid crystal dimming film according to claim 1, characterized in that, The PDCLC liquid crystal dimming film includes a release film, which is located on the side of the ITO film away from the electrochromic layer, and the release film is stacked with the ITO film.

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